20425402737 has 6 divisors (see below), whose sum is σ = 29503359522. Its totient is φ = 13616935152.

The previous prime is 20425402727. The next prime is 20425402741. The reversal of 20425402737 is 73720452402.

It is a happy number.

20425402737 is a `hidden beast` number, since 2 + 0 + 42 + 540 + 2 + 73 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18332889201 + 2092513536 = 135399^2 + 45744^2 .

It is not a de Polignac number, because 20425402737 - 2¹⁹ = 20424878449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20425402727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1134744588 + ... + 1134744605.

It is an arithmetic number, because the mean of its divisors is an integer number (4917226587).

Almost surely, 2^20425402737 is an apocalyptic number.

It is an amenable number.

20425402737 is a deficient number, since it is larger than the sum of its proper divisors (9077956785).

20425402737 is a wasteful number, since it uses less digits than its factorization.

20425402737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269489199 (or 2269489196 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 36.

The spelling of 20425402737 in words is "twenty billion, four hundred twenty-five million, four hundred two thousand, seven hundred thirty-seven".